Voir la notice de l'article provenant de la source Novi sad journal of mathematics website
@article{NSJOM_1981_11_Nonea_19, author = {Niki\'c Jovanka}, title = {On a structure {\cyrf} satisfying ({\cyrf}2+1)({\cyrf}2-a)=0}, journal = {Novi Sad Journal of Mathematics}, pages = {209-216}, publisher = {mathdoc}, volume = {11}, year = {1981}, url = {http://geodesic.mathdoc.fr/item/NSJOM_1981_11_Nonea_19/} }
Nikić Jovanka. On a structure ф satisfying (ф2+1)(ф2-a)=0. Novi Sad Journal of Mathematics, Tome 11 (1981). http://geodesic.mathdoc.fr/item/NSJOM_1981_11_Nonea_19/